Symposium on uses of radioactive carbon dating dating ru reg php
As reported in Nature, Professor Bray of the Instituto di Metrologia 'G.Colonetti', Turin, "confirmed that the results of the three laboratories were mutually compatible, and that, on the evidence submitted, none of the mean results was questionable." Although the quality of the radiocarbon testing itself is unquestioned, criticisms have been raised regarding the choice of the sample taken for testing, with suggestions that the sample may represent a medieval repair fragment rather than the image-bearing cloth. The blind-test method was abandoned, because the distinctive three-to-one herringbone twill weave of the shroud could not be matched in the controls, and it was therefore still possible for a laboratory to identify the shroud sample. group expected to perform the radiometric examination under its own aegis and after the other examinations had been completed, while the laboratories considered radio-carbon dating to be the prime test, which should be completed at the detriment of other tests, if necessary.The remaining sample, measuring 81 mm × 16 mm (3.19 in × 0.63 in) and weighing 300 mg, was first divided in two equal parts, one of which was preserved in a sealed container, in the custody of the Vatican, in case of future need.
Luigi Gonella claimed to have taken from the radiocarbon sample before it was distributed for dating.The actual provenance of these threads is uncertain, as Gonella was not authorized to take or retain genuine shroud material, Raymond Rogers stated in a 2005 article that he performed chemical analyses on these undocumented threads, and compared them to the undocumented Raes threads as well as the samples he had kept from his STURP work.He stated that his analysis showed: "The radiocarbon sample contains both a gum/dye/mordant coating and cotton fibers. that discarding the blind-test method would expose the results – whatever they may be – to suspicion of unreliability. Shredding the samples would not solve the problem, while making it much more difficult and wasteful to clean the samples properly.